Foot-power hammer.



G. E. ORAMER.

FOOT POWER HAMMER.

APPLICATION FILED NOV. 17, 1913.

1,099,025, Patented June 2, 1914,

Gem gc E Gamer;

COLUMBIA PLANDGRAFH 60.. WASHINGTON. D. c.

UNITED STATES PATENT QFFTUEB ONE-T121133) TD FRANK M. CARTER, (31PICNIC, FLGRIDA, ANT) ONE-THEE?) TO J'Qll'll LAItlElEN, 033

ST. PETIEBSBURG, FLORIDA.

FOOT-POWEP." HAMMER.

incense,

Specification of Letters Patent.

Patented Juno 191st.

Application filed November 17, 1913. Serial No. 801,451.

To all whom it may concern Be it known that l, Gnonon it. CRAMER, acitizen or". the United States, residing); at Tarpon Springs, in thecounty of llillsboro and State of Florida, have invented certain new anduseful Improvements in Foot- Power Hammers; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

The present invention relates to power hammers, and has for its purposeto provide a construction of hammer which will be capable of deliveringheavy and cushioned blows in rapid succession; and wherein theretracting movements of the hammer are cushioned and utilized to impartthe initial forces of the next succeeding blows.

A further purpose of the invention is to provide a structure which isespecially adapted for use in blacksmiths shops, foundries, and railroadshops; and which is of simple construction, and manner of operation, andinexpensive to install.

In the accompanying drawings forming a part of this application, and inwhich similar reference symbols indicate corresponding parts in theseveral views Figure 1 is a perspective view of the power hammercomplete; Fig. 2 is a transverse sectional view of a detail taken on theline 2-2 of Fig. 1, and looking in the direction of the arrow; and Fig.3 is a top plan sectional. view, showing the manner or" connectionbetween the actuating links and the hammer supporting shaft.

Referring to the construction in detail, the machine comprises a base 1having mounted thereon a supporting frame, consisting of four uprightbeams 2, connected in pairs or sections by cross bars 3, 4t and 5, andsaid sections are connected by the cross beams 6 and 7 the whole formingarigid structure.

The shaft 8 is journaled at the upper end of the frame in the cross bars5, and has its respective ends provided with crank arms 9 and 10 beingconnected, respectively, with the pair of link rods 11 through whichsaid cranks are actuated. A lever 12 is secured to the shaft 8 tooscillate therewith, and has mounted thereon the helve bar 13 of thehammer. Said bar is provided with an aperture, through which the lever15! passes, and a pin i l; on said lever holds the holve bar inposition.

The hammer has a substantial and resilient connection with the lever 12,through the medium of the leaf spring 15 comprising two strips that aresecured to the free end of the lever 19 by a clamping; plate 16 and anut 17. The free ends of the spring 15 engage with the helve bar 13 onopposite sides of the projection; lever por tion; the spring ends 18loeiin bent under and disposed against thehelve bar, and the spring ends19 are connected bv a pin 20 adapted to have movement within the slotprovided by the retaining' plate Bv having this resilient connectionbetween the operating); lever and the hammer, the inertia of thelattermay be more readilv overcome. thus making the machine easv ofoperation: and there is the further advantage that the delivery blow isof longer duration than would be the case if the connection in questionwere a rigid one,

A pair of treadlc bars 22 are fulcrumed on a shaft 23 secured to thesupporting frame, and a treadle 24 connects saidtreadle bars at the freeends thereof, and enough in advance of the anvil to give perfect freedomto the operator.

The link rods 11 connect the treadle at the points 26 with the cranks 9and 10 of the shaft supporting the hammer, and bv actuating the treadle2d the hammer will be operated by the operator, as will be clearlyunderstood.

The retraction spring 27 is anchored at one end to the bar 23, and atits opposite end is connected by a link 98, carried by lugs 29 (see Fin.3), projecting from the shaft 8. k

The retracting movements of the lever are adapted to be cushioned bymeans of a bar 30, that is movably mounted in a pair of guide members 31secured to the anvil block 32, and said bar 30 has its respective endsconstructed with hoo {S 32, that engage the free ends 33 of a pair ofsprings 3st, which are anchored to'the base 1 of the supportingstructure. -With this arrangement, the treadle bars 22 will, on theirretracting" movements be brought forcibly into engagement with theresiliently-inounted bar 30., and as a consequence the upward swing ofthe hammer will be cushioned and stopped, and the counter-recoilmovement of the springs 34 acting through the bars 30 and 22 willforcibly return the hammer, or impart thereto its initial stroke.

It is obvious that various changes might be made in the herein-describedconstruction without departing from the spirit of my invention.

1 claim 1. In a power hammer, the combination of a supporting structure;a crank shaft journaled on said structure; a lever fiXedly mounted onsaid crank shaft; a hammer helve fitted on said lever; a spring securedto said lever and having resilient engagement with said hammer helve; atreadle-bar ful crumed on the supporting structure; a treadle on saidtreadle-bar; a link connection between said treadle and the crank shaftfor actuating the hammer; and a retraction means for the hammer,substantially as described.

2. In a power hammer, the combination of a supporting structure; a crankshaft journaled on said structure; a lever fixedly mounted on said crankshaft; a hammer helve fitted on said lever; a leaf spring secured tosaid lever and having its respective ends in resilient engagement withsaid hammer helve; an anvil supporting block; a

pair of treadle-bars disposed to either side of said anvil supportingblock and fulcrumed on said supporting structure; a treadle mounted onsaid treadle-bars; a pair of links connecting said treadle with saidcrank shaft for actuating the hammer; and a retraction spring anchoredto said supporting structure and connected to said crank shaft;substantially as described.

3. In a power hammer, the combination of an upright supporting frame; ashaft journaled on said frame and having cranked ends; a lever fixedlymounted on said shaft; a hammer helve fitted on said lever; a leafspring secured to said lever and having its respective ends infrictional and resilient engagement with said hammer helve; a pair oftreadle-bars disposed to either side of and fulcrumed on said frame; atreadle connect- F ing said treadle-bars; a pair of links connectingsaid treadle with the crank ends of said shaft for actuating the hammer;and a retraction spring for the hammer, substantially as described.

In testimony whereof, I affiX my signature, in presence of twowitnesses.

GEORGE E. GRAMER.

lVitnesses VVILLIAM F. HINES, VALTER P. Bnvis.

Copies of this patent may be obtained for five cents each, by addressingthe Gommissioner of Patents, Washington, D. C.

